I actually don't want that boring 'authors' screensaver any more than I want the ads. I like the K3, use it a lot, and I want to put my own screensaver images on it. I also need wifi because I use Calibre to push some blogs and news feeds to the Kindle.
I won't feel at all guilty about jailbreaking it and skipping the ads. Amazon knows that many people who bought the $114 version will never look at the ads, much less buy the products, and you can be sure that Amazon makes a profit on the device even at $114 - and anyway, I also buy books.